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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21229c799bf0179547719c8d58fe1c52ebb7dfd4d9a64da9f13dc943a9efe7db' 
  AND token = 'WzLiDlHaXouijbD3BSCrzNq3zhijItRUelzJ76ja7CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}